Juniper Networks G10 CMTS manual Modem Management

DOCSIS Module

Modem Management	•
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The DOCSIS Module exercises functional management over MAC layer and cable modem	•
processes.	•
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MAC Layer Scheduling	•
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Management at the MAC layer includes the following scheduling functions:	•
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! Queueing upstream requests.	•
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! Transmission opportunity allocation based on MAC messages from cable modems.	•
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! QoS scheduling requirements, including congestion control, which have priority over	•
normal service flows.	•
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! Prioritizing service flows for least delay.	•
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! Maintenance opportunity allocation, including initial maintenance alignment.	•
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Cable Modem Management	•
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The DOCSIS Module performs the following cable modem management functions:	•
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! Registration of cable modems by service identifier (SID) assignments, and recording	•
time and address failures.	•
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! Ranging by adjusting timing offset, transmit power, carrier frequency, and transmit	•
equalizer taps.	•
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Enhanced Routing and Bridging Features	•
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The DOCSIS Module provides the following enhanced routing and bridging features that	•
provide additional value to MSOs:	•
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! Simultaneous IP routing (Layer 3) and IEEE 802.1 bridging (Layer 2).	•
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! ARP proxy.	•
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! Address authentication for ARP and IP packets.	•
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! 802.1Q and stacked 802.1Q VLANs.	•
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! Security and service class assignment to multicast service flows.	•
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! IGMP packet snooping.	•
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See the JUNOSg Software Configuration Guide: Getting Started and System Management and the	•
JUNOSg Software Configuration Guide: Interfaces, Cable, Policy, and Routing and Routing	•
Protocols for more information on these and other DOCSIS Module features.	•
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Hardware Component Overview 35